MR-DI4 Modbus RTU

Description

The Modbus module with 4 digital inputs was developed for decentralized switching tasks. It is suitable for detecting potential-free switch states, for example electrical limit switches on vent valves or auxiliary contacts of power contactors. The inputs can be operated by means of potential-free switches or contacts or used as voltage inputs. The inputs can be scanned by means of standard registers via a Modbus master. Module address, bit rate and parity are set with 2 rotary switches on the front or by software. Suitable for decentralized mounting on DIN TH35 rail according to IEC 60715 in electrical distribution cabinets.

Connection with screw type terminal blocks

Technical Data

General Data

Protocol

Modbus RTU

Address range

00 to 99

Bus interface

RS485 (two-wire bus)

Transmission rate

1200 to 115200 bit/s

Operating voltage

24 V AC/DC +/- 10 % (SELV)

Current consumption

50 mA (AC) / 20 mA (DC)

Relative duty cycle

100 %

Inputs

4 x digital

Input / voltage

30 V AC/DC

Input / high signal

more than 7 V AC/DC

Display

Green, red and yellow LED

Dimensions (W x H x D)

35 x 69.3 x 60 mm

Weight

95 g

Operating temperature range

-5 °C to 55 °C

Storage temperature range

-20 °C to 70 °C

Ingress protection for housing / terminal blocks

IP40 / IP20

Check US distributor inventory

Accessories

Terminal block Type 259

HUB DC

Power supply NG4 24 V DC

Typ 135 RIACON 135_3.5

Accessory of

MR-GW
Modbus RTU / Modbus TCP Gateway

MR-F-GW
Modbus RTU / Modbus TCP Gateway

Part number

Part number:

1108341319

EAN:

4250184135647

Downloads

Brochure (Data logger)
Brochure (Modbus Gateway - Network connection of Modbus RTU fieldbus components)
Brochure (Modbus RTU components)
3D-Data - Registration required -
Mounting note (1108341319, 110834131970)
Mounting note (Safety Instructions multilingual )
Data sheet
ePLAN data - Registration required -

FAQ's

What can I do if the red ERROR LED on the module lights up or there is no communication?

There are several possible causes, please check the following:

- Operating voltage (A1 / A2) connected and sufficient for the device.
- BUS (A- / B+) connected and not reversed. Pay attention to (- / +), not to A/B.
- Address (rotary switches) set correctly, must not occur twice or be 0.
- Bit rate and parity (rotary switches) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted pair cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available on the BUS.
- Timeout high enough for all participants to respond (approx. 10 ms).

What can I do if the red ERROR LED on the module lights up or there is no communication?

There are several possible causes, please check the following:

- Operating voltage (A1 / A2) connected and sufficient for the device.
- BUS (A- / B+) connected and not reversed. Pay attention to (- / +), not to A/B.
- Address (rotary switches) set correctly, must not occur twice or be 0.
- Bit rate (rotary switches) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted pair cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available on the BUS.
- Max Master as high as the number of physical master I/Os on the BUS.
- Max Frame high enough for all answers from participants to get through (BMT-RTR setting).

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Additional Information

I/O components – Automation in buildings, systems and machinery